Why is one nostril usually more blocked than the other?
Show answer & explanation
Answer: Your nose rotates airflow sides
One side traps more dirt — Wrong. Dirt can clog either side, but the usual side-to-side change happens even in healthy noses. Nasal tissue naturally swells and shrinks in turns.
Your nose rotates airflow sides ✓ — Correct! Most people have a normal nasal cycle. Blood vessels in the lining of one side swell while the other side opens more, then they switch. You notice it more when lying down, resting, or having a cold.
One nostril is built smaller — Wrong. Small differences can exist, but the repeating blocked-then-open pattern is usually caused by the nasal cycle, not one side being permanently made to do most of the work.